Bug 1460452 - flooding module-x11-bell with bells causes pulseaudio to crash with SIGKILL
flooding module-x11-bell with bells causes pulseaudio to crash with SIGKILL
Status: NEW
Product: Fedora
Classification: Fedora
Component: pulseaudio (Show other bugs)
26
Unspecified Unspecified
unspecified Severity medium
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Assigned To: Lennart Poettering
Fedora Extras Quality Assurance
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Reported: 2017-06-10 14:56 EDT by Peter Backes
Modified: 2017-11-16 18:04 EST (History)
4 users (show)

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Description Peter Backes 2017-06-10 14:56:32 EDT
Description of problem:
If I accidentally cat a binary file with many BEL characters, pulseaudio crashes with SIGKILL.

signal monitor on the pulseaudio process:

% sudo stap /usr/share/systemtap/examples/process/sigmon.stp -x 8347 SIGKILL
Missing separate debuginfos, use: debuginfo-install kernel-PAE-core-4.11.3-202.fc25.i686 
SPID     SNAME            RPID  RNAME            SIGNUM SIGNAME         
8347     alsa-sink-ALC88  8347  alsa-sink-ALC88  9      SIGKILL         

Version-Release number of selected component (if applicable):
pulseaudio-module-x11-10.0-2.fc25.i686

How reproducible:
always

Steps to Reproduce:
1. /usr/bin/pactl upload-sample /usr/share/sounds/freedesktop/stereo/bell.oga
2. /usr/bin/pactl load-module module-x11-bell "display=$DISPLAY" "sample=bell"
3. for i in `seq 1 512`; do echo -e '\a\c'; done

Actual results:
some sounds are heard, before pulseaudio crashes with SIGKILL

Expected results:
pulseaudio should work fine even if pulseaudio-module-x11 is flooded with bells.

Additional info:
When stracing the alsa-sink-ALC88 thread, the problem cannot be reproduced... heisenbug. But pulseaudio then sometimes logs lots of "[pulseaudio] sink-input.c: Failed to create sink input: too many inputs per sink."
Comment 1 Wim Taymans 2017-06-12 03:14:56 EDT
I'm pretty sure puleseaudio is killed ny RTKit because it uses too many realtime CPU cycles. Need to think about how this can be avoided..
Comment 2 Fedora End Of Life 2017-11-16 13:39:41 EST
This message is a reminder that Fedora 25 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 25. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as EOL if it remains open with a Fedora  'version'
of '25'.

Package Maintainer: If you wish for this bug to remain open because you
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Comment 3 Peter Backes 2017-11-16 18:04:28 EST
Still reproducible on f26

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